//
// Mixins
// --------------------------------------------------

// UTILITY MIXINS
// --------------------------------------------------

// Clearfix
// --------
// For clearing floats like a boss h5bp.com/q
@mixin clearfix {
  *zoom: 1;

  &:before,
  &:after {
    display: table;
    content: "";

    // Fixes Opera/contenteditable bug:
    // http://nicolasgallagher.com/micro-clearfix-hack/#comment-36952
    line-height: 0;
  }

  &:after {
    clear: both;
  }
}

.clearfix {
  @include clearfix;
}

// Webkit-style focus
// ------------------
@mixin tab-focus {
  // Default
  outline: thin dotted #333;

  // Webkit
  outline: 5px auto -webkit-focus-ring-color;
  outline-offset: -2px;
}

// Center-align a block level element
// ----------------------------------
@mixin center-block {
  display: block;
  margin-left: auto;
  margin-right: auto;
}

// IE7 inline-block
// ----------------
@mixin ie7-inline-block {
  *display: inline;

  /* IE7 inline-block hack */
  *zoom: 1;
}

// IE7 likes to collapse whitespace on either side of the inline-block elements.
// Ems because we're attempting to match the width of a space character. Left
// version is for form buttons, which typically come after other elements, and
// right version is for icons, which come before. Applying both is ok, but it will
// mean that space between those elements will be .6em (~2 space characters) in IE7,
// instead of the 1 space in other browsers.
@mixin ie7-restore-left-whitespace {
  *margin-left: 0.3em;

  &:first-child {
    *margin-left: 0;
  }
}

@mixin ie7-restore-right-whitespace {
  *margin-right: 0.3em;
}

// Sizing shortcuts
// -------------------------
@mixin size($height, $width) {
  width: $width;
  height: $height;
}

@mixin square($size) {
  @include size($size, $size);
}

// Placeholder text
// -------------------------
@mixin placeholder($color: $placeholderText) {
  &:-moz-placeholder {
    color: $color;
  }

  &:-ms-input-placeholder {
    color: $color;
  }

  &::-webkit-input-placeholder {
    color: $color;
  }
}

// Text overflow
// -------------------------
// Requires inline-block or block for proper styling
@mixin text-overflow {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

// CSS image replacement
// -------------------------
// Source: https://github.com/h5bp/html5-boilerplate/commit/aa0396eae757
@mixin hide-text {
  font: 0/0 a;
  color: transparent;
  text-shadow: none;
  background-color: transparent;
  border: 0;
}

// FONTS
// --------------------------------------------------
@mixin font-family-serif {
  font-family: $serifFontFamily;
}

@mixin font-family-sans-serif {
  font-family: $sansFontFamily;
}

@mixin font-family-monospace {
  font-family: $monoFontFamily;
}

@mixin font-shorthand(
  $size: $baseFontSize,
  $weight: normal,
  $lineHeight: $baseLineHeight
) {
  font-size: $size;
  font-weight: $weight;
  line-height: $lineHeight;
}

@mixin font-serif(
  $size: $baseFontSize,
  $weight: normal,
  $lineHeight: $baseLineHeight
) {
  @include font-family-serif;

  @include font-shorthand($size, $weight, $lineHeight);
}

@mixin font-sans-serif(
  $size: $baseFontSize,
  $weight: normal,
  $lineHeight: $baseLineHeight
) {
  @include font-family-sans-serif;

  @include font-shorthand($size, $weight, $lineHeight);
}

@mixin font-monospace(
  $size: $baseFontSize,
  $weight: normal,
  $lineHeight: $baseLineHeight
) {
  @include font-family-monospace;

  @include font-shorthand($size, $weight, $lineHeight);
}

// FORMS
// --------------------------------------------------

// Block level inputs
@mixin input-block-level {
  display: block;
  width: 100%;
  min-height: 30px;

  // Make inputs at least the height of their button counterpart
  @include box-sizing(border-box);

  // Makes inputs behave like true block-level elements
}

// Mixin for form field states
@mixin formFieldState(
  $textColor: #555,
  $borderColor: #ccc,
  $backgroundColor: #f5f5f5
) {
  // Set the text color
  > label,
  .help-block,
  .help-inline {
    color: $textColor;
  }

  // Style inputs accordingly
  .checkbox,
  .radio,
  input,
  select,
  textarea {
    color: $textColor;
    border-color: $borderColor;

    @include box-shadow(inset 0 1px 1px rgba(0, 0, 0, 0.075));

    // Redeclare so transitions work
    &:focus {
      border-color: darken($borderColor, 10%);

      // Write out in full since the lighten() function isn't easily escaped
      -webkit-box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075),
        0 0 6px lighten($borderColor, 20%);
      -moz-box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075),
        0 0 6px lighten($borderColor, 20%);
      box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075),
        0 0 6px lighten($borderColor, 20%);
    }
  }

  // Give a small background color for input-prepend/-append
  .input-prepend .add-on,
  .input-append .add-on {
    color: $textColor;
    background-color: $backgroundColor;
    border-color: $textColor;
  }
}

// CSS3 PROPERTIES
// --------------------------------------------------

// Border Radius
@mixin border-radius($radius) {
  -webkit-border-radius: $radius;
  -moz-border-radius: $radius;
  border-radius: $radius;
}

// Single Corner Border Radius
@mixin border-top-left-radius($radius) {
  -webkit-border-top-left-radius: $radius;
  -moz-border-radius-topleft: $radius;
  border-top-left-radius: $radius;
}

@mixin border-top-right-radius($radius) {
  -webkit-border-top-right-radius: $radius;
  -moz-border-radius-topright: $radius;
  border-top-right-radius: $radius;
}

@mixin border-bottom-right-radius($radius) {
  -webkit-border-bottom-right-radius: $radius;
  -moz-border-radius-bottomright: $radius;
  border-bottom-right-radius: $radius;
}

@mixin border-bottom-left-radius($radius) {
  -webkit-border-bottom-left-radius: $radius;
  -moz-border-radius-bottomleft: $radius;
  border-bottom-left-radius: $radius;
}

// Single Side Border Radius
@mixin border-top-radius($radius) {
  @include border-top-right-radius($radius);

  @include border-top-left-radius($radius);
}

@mixin border-right-radius($radius) {
  @include border-top-right-radius($radius);

  @include border-bottom-right-radius($radius);
}

@mixin border-bottom-radius($radius) {
  @include border-bottom-right-radius($radius);

  @include border-bottom-left-radius($radius);
}

@mixin border-left-radius($radius) {
  @include border-top-left-radius($radius);

  @include border-bottom-left-radius($radius);
}

// Drop shadows
@mixin box-shadow($shadow) {
  -webkit-box-shadow: $shadow;
  -moz-box-shadow: $shadow;
  box-shadow: $shadow;
}

// Transitions
@mixin transition($transition) {
  -webkit-transition: $transition;
  -moz-transition: $transition;
  -o-transition: $transition;
  transition: $transition;
}

// Transformations
@mixin rotate($degrees) {
  -webkit-transform: rotate($degrees);
  -moz-transform: rotate($degrees);
  -ms-transform: rotate($degrees);
  -o-transform: rotate($degrees);
  transform: rotate($degrees);
}

@mixin scale($ratio) {
  -webkit-transform: scale($ratio);
  -moz-transform: scale($ratio);
  -ms-transform: scale($ratio);
  -o-transform: scale($ratio);
  transform: scale($ratio);
}

@mixin translate($x, $y) {
  -webkit-transform: translate($x, $y);
  -moz-transform: translate($x, $y);
  -ms-transform: translate($x, $y);
  -o-transform: translate($x, $y);
  transform: translate($x, $y);
}

@mixin skew($x, $y) {
  -webkit-transform: skew($x, $y);
  -moz-transform: skew($x, $y);
  -ms-transform: skew($x, $y);
  -o-transform: skew($x, $y);
  transform: skew($x, $y);
}

@mixin translate3d($x, $y, $z) {
  -webkit-transform: translate3d($x, $y, $z);
  -moz-transform: translate3d($x, $y, $z);
  -o-transform: translate3d($x, $y, $z);
  transform: translate3d($x, $y, $z);
}

// Backface visibility
// Prevent browsers from flickering when using CSS 3D transforms.
// Default value is `visible`, but can be changed to `hidden
// See git pull https://github.com/dannykeane/bootstrap.git backface-visibility for examples
@mixin backface-visibility($visibility) {
  -webkit-backface-visibility: $visibility;
  -moz-backface-visibility: $visibility;
  backface-visibility: $visibility;
}

// Background clipping
// Heads up: FF 3.6 and under need "padding" instead of "padding-box"
@mixin background-clip($clip) {
  -webkit-background-clip: $clip;
  -moz-background-clip: $clip;
  background-clip: $clip;
}

// Background sizing
@mixin background-size($size) {
  -webkit-background-size: $size;
  -moz-background-size: $size;
  -o-background-size: $size;
  background-size: $size;
}

// Box sizing
@mixin box-sizing($boxmodel) {
  -webkit-box-sizing: $boxmodel;
  -moz-box-sizing: $boxmodel;
  box-sizing: $boxmodel;
}

// User select
// For selecting text on the page
@mixin user-select($select) {
  -webkit-user-select: $select;
  -moz-user-select: $select;
  -ms-user-select: $select;
  -o-user-select: $select;
  user-select: $select;
}

// Resize anything
@mixin resizable($direction) {
  resize: $direction;

  // Options: horizontal, vertical, both
  overflow: auto;

  // Safari fix
}

// CSS3 Content Columns
@mixin content-columns($columnCount, $columnGap: $gridGutterWidth) {
  -webkit-column-count: $columnCount;
  -moz-column-count: $columnCount;
  column-count: $columnCount;
  -webkit-column-gap: $columnGap;
  -moz-column-gap: $columnGap;
  column-gap: $columnGap;
}

// Optional hyphenation
@mixin hyphens($mode: auto) {
  word-wrap: break-word;
  -webkit-hyphens: $mode;
  -moz-hyphens: $mode;
  -ms-hyphens: $mode;
  -o-hyphens: $mode;
  hyphens: $mode;
}

// Opacity
@mixin opacity($opacity) {
  opacity: $opacity;
  filter: alpha(opacity=#{$opacity * 100});
}

// BACKGROUNDS
// --------------------------------------------------

// Add an alphatransparency value to any background or border color (via Elyse Holladay)
@mixin translucent-background($color: $white, $alpha: 1) {
  background-color: hsla(
    hue($color),
    saturation($color),
    lightness($color),
    $alpha
  );
}

@mixin translucent-border($color: $white, $alpha: 1) {
  border-color: hsla(
    hue($color),
    saturation($color),
    lightness($color),
    $alpha
  );

  @include background-clip(padding-box);
}

// Gradient Bar Colors for buttons and alerts
@mixin gradientBar(
  $primaryColor,
  $secondaryColor,
  $textColor: #fff,
  $textShadow: 0 -1px 0 rgba(0, 0, 0, 0.25)
) {
  color: $textColor;
  text-shadow: $textShadow;

  @include gradient-vertical($primaryColor, $secondaryColor);

  border-color: $secondaryColor $secondaryColor darken($secondaryColor, 15%);
  border-color: rgba(0, 0, 0, 0.1) rgba(0, 0, 0, 0.1)
    fadein(rgba(0, 0, 0, 0.1), 15%);
}

// Gradients
@mixin gradient-horizontal($startColor: #555, $endColor: #333) {
  background-color: $endColor;
  background-image: -moz-linear-gradient(left, $startColor, $endColor);

  // FF 3.6+
  background-image: -webkit-gradient(
    linear,
    0 0,
    100% 0,
    from($startColor),
    to($endColor)
  );

  // Safari 4+, Chrome 2+
  background-image: -webkit-linear-gradient(left, $startColor, $endColor);

  // Safari 5.1+, Chrome 10+
  background-image: -o-linear-gradient(left, $startColor, $endColor);

  // Opera 11.10
  background-image: linear-gradient(to right, $startColor, $endColor);

  // Standard, IE10
  background-repeat: repeat-x;
  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#{ie-hex-str($startColor)}', endColorstr='#{ie-hex-str($endColor)}', GradientType=1);

  // IE9 and down
}

@mixin gradient-vertical($startColor: #555, $endColor: #333) {
  background-color: mix($startColor, $endColor, 60%);
  background-image: -moz-linear-gradient(top, $startColor, $endColor);

  // FF 3.6+
  background-image: -webkit-gradient(
    linear,
    0 0,
    0 100%,
    from($startColor),
    to($endColor)
  );

  // Safari 4+, Chrome 2+
  background-image: -webkit-linear-gradient(top, $startColor, $endColor);

  // Safari 5.1+, Chrome 10+
  background-image: -o-linear-gradient(top, $startColor, $endColor);

  // Opera 11.10
  background-image: linear-gradient(to bottom, $startColor, $endColor);

  // Standard, IE10
  background-repeat: repeat-x;
  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#{ie-hex-str($startColor)}', endColorstr='#{ie-hex-str($endColor)}', GradientType=0);

  // IE9 and down
}

@mixin gradient-directional($startColor: #555, $endColor: #333, $deg: 45deg) {
  background-color: $endColor;
  background-repeat: repeat-x;
  background-image: -moz-linear-gradient($deg, $startColor, $endColor);

  // FF 3.6+
  background-image: -webkit-linear-gradient($deg, $startColor, $endColor);

  // Safari 5.1+, Chrome 10+
  background-image: -o-linear-gradient($deg, $startColor, $endColor);

  // Opera 11.10
  background-image: linear-gradient($deg, $startColor, $endColor);

  // Standard, IE10
}

@mixin gradient-vertical-three-colors(
  $startColor: #00b3ee,
  $midColor: #7a43b6,
  $colorStop: 50%,
  $endColor: #c3325f
) {
  background-color: mix($midColor, $endColor, 80%);
  background-image: -webkit-gradient(
    linear,
    0 0,
    0 100%,
    from($startColor),
    color-stop($colorStop, $midColor),
    to($endColor)
  );
  background-image: -webkit-linear-gradient(
    $startColor,
    $midColor $colorStop,
    $endColor
  );
  background-image: -moz-linear-gradient(
    top,
    $startColor,
    $midColor ($colorStop * 100%),
    $endColor
  );
  background-image: -o-linear-gradient(
    $startColor,
    $midColor $colorStop,
    $endColor
  );
  background-image: linear-gradient(
    $startColor,
    $midColor $colorStop,
    $endColor
  );
  background-repeat: no-repeat;
  filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#{ie-hex-str($startColor)}', endColorstr='#{ie-hex-str($endColor)}', GradientType=0);

  // IE9 and down, gets no color-stop at all for proper fallback
}

@mixin gradient-radial($innerColor: #555, $outerColor: #333) {
  background-color: $outerColor;
  background-image: -webkit-gradient(
    radial,
    center center,
    0,
    center center,
    460,
    from($innerColor),
    to($outerColor)
  );
  background-image: -webkit-radial-gradient(circle, $innerColor, $outerColor);
  background-image: -moz-radial-gradient(circle, $innerColor, $outerColor);
  background-image: -o-radial-gradient(circle, $innerColor, $outerColor);
  background-repeat: no-repeat;
}

@mixin gradient-striped($color, $angle: 45deg) {
  background-color: $color;
  background-image: -webkit-gradient(
    linear,
    0 100%,
    100% 0,
    color-stop(0.25, rgba(255, 255, 255, 0.15)),
    color-stop(0.25, transparent),
    color-stop(0.5, transparent),
    color-stop(0.5, rgba(255, 255, 255, 0.15)),
    color-stop(0.75, rgba(255, 255, 255, 0.15)),
    color-stop(0.75, transparent),
    to(transparent)
  );
  background-image: -webkit-linear-gradient(
    $angle,
    rgba(255, 255, 255, 0.15) 25%,
    transparent 25%,
    transparent 50%,
    rgba(255, 255, 255, 0.15) 50%,
    rgba(255, 255, 255, 0.15) 75%,
    transparent 75%,
    transparent
  );
  background-image: -moz-linear-gradient(
    $angle,
    rgba(255, 255, 255, 0.15) 25%,
    transparent 25%,
    transparent 50%,
    rgba(255, 255, 255, 0.15) 50%,
    rgba(255, 255, 255, 0.15) 75%,
    transparent 75%,
    transparent
  );
  background-image: -o-linear-gradient(
    $angle,
    rgba(255, 255, 255, 0.15) 25%,
    transparent 25%,
    transparent 50%,
    rgba(255, 255, 255, 0.15) 50%,
    rgba(255, 255, 255, 0.15) 75%,
    transparent 75%,
    transparent
  );
  background-image: linear-gradient(
    $angle,
    rgba(255, 255, 255, 0.15) 25%,
    rgba(0, 0, 0, 0) 25%,
    rgba(0, 0, 0, 0) 50%,
    rgba(255, 255, 255, 0.15) 50%,
    rgba(255, 255, 255, 0.15) 75%,
    rgba(0, 0, 0, 0) 75%,
    rgba(0, 0, 0, 0)
  );
}

// Reset filters for IE
@mixin reset-filter {
  filter: progid:DXImageTransform.Microsoft.gradient(enabled = false);
}

// COMPONENT MIXINS
// --------------------------------------------------

// Horizontal dividers
// -------------------------
// Dividers (basically an hr) within dropdowns and nav lists
@mixin nav-divider($top: #e5e5e5, $bottom: $white) {
  // IE7 needs a set width since we gave a height. Restricting just
  // to IE7 to keep the 1px left/right space in other browsers.
  // It is unclear where IE is getting the extra space that we need
  // to negative-margin away, but so it goes.
  *width: 100%;
  height: 1px;
  margin: ($baseLineHeight / 2 - 1) 1px;

  // 8px 1px
  *margin: -5px 0 5px;
  overflow: hidden;
  background-color: $top;
  border-bottom: 1px solid $bottom;
}

// Button backgrounds
// ------------------
@mixin buttonBackground(
  $startColor,
  $endColor,
  $textColor: #fff,
  $textShadow: 0 -1px 0 rgba(0, 0, 0, 0.25)
) {
  // gradientBar will set the background to a pleasing blend of these, to support IE<=9
  @include gradientBar($startColor, $endColor, $textColor, $textShadow);

  *background-color: $endColor;

  /* Darken IE7 buttons by default so they stand out more given they won't have borders */
  @include reset-filter;

  // in these cases the gradient won't cover the background, so we override
  &:hover,
  &:active,
  &.active,
  &.disabled,
  &[disabled] {
    color: $textColor;
    background-color: $endColor;
    *background-color: darken($endColor, 5%);
  }

  // IE 7 + 8 can't handle box-shadow to show active, so we darken a bit ourselves
  &:active,
  &.active {
    background-color: darken($endColor, 10%) \9;
  }
}

// Navbar vertical align
// -------------------------
// Vertically center elements in the navbar.
// Example: an element has a height of 30px, so write out `.navbarVerticalAlign(30px);` to calculate the appropriate top margin.
@mixin navbarVerticalAlign($elementHeight) {
  margin-top: ($navbarHeight - $elementHeight) / 2;
}

// Grid System
// -----------

// Centered container element
@mixin container-fixed {
  margin-right: auto;
  margin-left: auto;

  @include clearfix;
}

// Table columns
@mixin tableColumns($columnSpan: 1) {
  float: none;

  // undo default grid column styles
  width: $gridColumnWidth * $columnSpan + $gridGutterWidth * ($columnSpan - 1) -
    16;

  // 16 is total padding on left and right of table cells
  margin-left: 0;

  // undo default grid column styles
}

// Make a Grid
// Use .makeRow and .makeColumn to assign semantic layouts grid system behavior
@mixin makeRow {
  margin-left: $gridGutterWidth * -1;

  @include clearfix;
}

@mixin makeColumn($columns: 1, $offset: 0) {
  float: left;
  margin-left: $gridColumnWidth * $offset + $gridGutterWidth * ($offset - 1) +
    $gridGutterWidth * 2;
  width: $gridColumnWidth * $columns + $gridGutterWidth * ($columns - 1);
}

// The Grid
@mixin grid-core($gridColumnWidth, $gridGutterWidth) {
  .row {
    margin-left: $gridGutterWidth * -1;

    @include clearfix;
  }

  [class*="span"] {
    float: left;
    margin-left: $gridGutterWidth;
  }

  // Set the container width, and override it for fixed navbars in media queries
  .container,
  .navbar-static-top .container,
  .navbar-fixed-top .container,
  .navbar-fixed-bottom .container {
    @include grid-core-span($gridColumns, $gridColumnWidth, $gridGutterWidth);
  }

  @include grid-core-spanX($gridColumns, $gridColumnWidth, $gridGutterWidth);

  @include grid-core-offsetX($gridColumns, $gridColumnWidth, $gridGutterWidth);
}

@mixin grid-core-spanX($cols, $columnWidth, $gutterWidth) {
  @for $i from 1 through $cols {
    .span#{$i} {
      @include grid-core-span($i, $columnWidth, $gutterWidth);
    }
  }
}

@mixin grid-core-span($columns, $columnWidth, $gutterWidth) {
  width: $columnWidth * $columns + $gutterWidth * ($columns - 1);
}

@mixin grid-core-offsetX($cols, $columnWidth, $gutterWidth) {
  @for $i from 1 through $cols {
    .offset#{$i} {
      @include grid-core-offset($i, $columnWidth, $gutterWidth);
    }
  }
}

@mixin grid-core-offset($columns, $columnWidth, $gutterWidth) {
  margin-left: $columnWidth * $columns + $gutterWidth * ($columns + 1);
}

@mixin grid-fluid($columnWidth, $gutterWidth) {
  .row-fluid {
    width: 100%;

    @include clearfix;

    [class*="span"] {
      @include input-block-level;

      float: left;
      margin-left: $gutterWidth;
      *margin-left: $gutterWidth - 0.5px / $gridRowWidth * 100 * 1%;
    }

    [class*="span"]:first-child {
      margin-left: 0;
    }

    // generate .spanX and .offsetX
    @for $i from 1 through $gridColumns {
      .span#{$i} {
        @include grid-fluid-span($i, $columnWidth, $gutterWidth);
      }

      .offset#{$i} {
        @include grid-fluid-offset($i, $columnWidth, $gutterWidth);
      }

      .offset#{$i}:first-child {
        @include grid-fluid-offsetFirstChild($i, $columnWidth, $gutterWidth);
      }
    }
  }
}

@mixin grid-fluid-span($columns, $columnWidth, $gutterWidth) {
  width: $columnWidth * $columns + $gutterWidth * ($columns - 1);
  *width: $columnWidth * $columns + $gutterWidth * ($columns - 1) - 0.5px /
    $gridRowWidth * 100 * 1%;
}

@mixin grid-fluid-offset($columns, $columnWidth, $gutterWidth) {
  margin-left: $columnWidth * $columns + $gutterWidth * ($columns - 1) +
    $gutterWidth * 2;
  *margin-left: $columnWidth * $columns + $gutterWidth * ($columns - 1) - 0.5px /
    $gridRowWidth * 100 * 1% + $gutterWidth * 2 - 0.5px / $gridRowWidth * 100 *
    1%;
}

@mixin grid-fluid-offsetFirstChild($columns, $columnWidth, $gutterWidth) {
  margin-left: $columnWidth * $columns + $gutterWidth * ($columns - 1) +
    $gutterWidth;
  *margin-left: $columnWidth * $columns + $gutterWidth * ($columns - 1) - 0.5px /
    $gridRowWidth * 100 * 1% + $gutterWidth - 0.5px / $gridRowWidth * 100 * 1%;
}

@mixin grid-input($columnWidth, $gutterWidth) {
  input,
  textarea,
  .uneditable-input {
    margin-left: 0;

    // override margin-left from core grid system
  }

  // Space grid-sized controls properly if multiple per line
  .controls-row [class*="span"] + [class*="span"] {
    margin-left: $gutterWidth;
  }

  @for $i from 1 through $gridColumns {
    input.span#{$i},
    textarea.span#{$i},
    .uneditable-input.span#{$i} {
      @include grid-input-span($i, $columnWidth, $gutterWidth);
    }
  }
}

@mixin grid-input-span($columns, $columnWidth, $gutterWidth) {
  width: $columnWidth * $columns + $gutterWidth * ($columns - 1) - 14;
}
